Apparatus of heat treatment for synthetic yarns



Jan. 17, 1967 N. KODAIRA 3,293,430

' APPARATUS OF HEAT TREATMENT FOR SYNTHETIC YARNS Filed Sept. 10, 1963 dmdm'vfia-v Na buhzsa Km ciazra United States Patent 3,298,430 APPARATUS OF HEAT TREATMENT FOR SYNTHETIC YARNS Nobuhisa Kodaira, 851 Kamirenjaku, Mitaka-shi, Tokyo-to, Japan Filed Sept. 10, 1963, Ser. No. 308,007 Claims priority, application Japan, Oct. 19, 1962, 37/61,045, 37/61,046 3 Claims. (Cl. 165105) This invention relates to improvement in an apparatus for heat treatment to be applied when yarn of synthetic fibers is processed.

Generally a heat treatment apparatus of this kind is designed to let a crimped yarn pass through into a metal cylinder or slit so that the crimped state of yarn is well heat set.

In the conventional means for carrying out heating, such a way has been taken that a heating wire is wound around the metal cylinder or structural portion of slits. However assuming that a heating wire is wound around the metal cylinder in an equal spacing, it happens that temperature in the upper and lower end portions thereof are apt to be lower whilst the middle portion is considerably higher.

For compensating this, from the theoretical view, following method will be taken in consideration, that is, for both end portions of the cylinder, winding of a heating wire is to be closer and for middle portion thereof to be wound with greater spacing so that the temperature will be uniform over the entire length of the metal cylinder.

However even with this, in putting this in practice, it is very difficult to determine exactly how much of the winding is to be closely spaced and how much is to be wound with greater spacing. Therefore whereas this method of keeping a uniform temperature over the whole length of the metal cylinder is theoretically right, in the actual application, it is almost impossible to achieve this aim in a satisfactory manner. Moreover because of the connectional arrangement with the crimping apparatus, such cylinders are to be alined in numbers so that it is also very hard to regulate all the individual cylinders to keep them substantially at the same temperature.

The present invention contemplates overcoming such disadvantage and provides an improved device for the heat treatment in this field.

Reference is to be had to the accompanying drawings in which:

FIG. 1 is a front view of one form of embodiment of an apparatus with a part broken away.

FIG. 2 is a sectional view taken along the line II-II in FIG. 1.

FIG. 3 is an enlarged scale of a part thereof.

FIG. 4 is a front view of one form of another embodiment.

FIG. 5 is a sectional view taken along the line V-V in FIG. 4.

Referring now to the embodiment shown in FIGS. 1-3, the same comprises a vessel generally designated as 1 and a plurality of heating cylinders 2 with both ends open which extend through the said vessel. A threaded guide eyelet 3 is fixed into the upper end of each cylinder. A heater 4 is provided in the bottom part of the vessel where a heat transfer medium 5 is filled. This heat 3,298,430 Patented Jan. 17, 1967 transfer medium is heated by the heater 4 to produce heat transfer vapor 6 and said cylinder 2 is heated by such medium 5 and vapor 6.

Yarn 7 after being crimped by a crimping device is continuously let into the heating cylinder 2 and passed therethrough at a desired speed, during which the crimped state of the yarn is completely heat set.

This apparatus is so designed that the vessel 1 is filled with hot vapor 6 and the latent heat thereof heats the cylinder 2, the thermal capacity being large enough to enable an individual cylinder 2 to be kept in a predetermined temperature uniformly along its entire length.

Further, with a number of the cylinders arranged Within a same vessel, all individual cylinders can maintain substantially an equal temperature.

When the cylinder is troubled with crimped yarn clogged therein, the guide eyelet 3 may be screwed off and the interior of the cylinder may be cleaned.

Another embodiment is shown in FIGS. 4 and 5 wherein a plurality of vessels 11, each of which has narrow channels 12 in its outside, are connected to one another with upper communicating tubes 13 and lower communieating tubes 14, thus an assembled vessel as generally designated as 15 is formed from such a number of minor vessels 11. A heater 17 is provided in the bottom inside the vessel 15. Therein 16 represents a heat transfer medium, 19 heat transfer vapor and 18 crimped yarn.

In operation of the apparatus, crimped yarn 18 is let into the narrow channel 12 as shown in FIG. 5 and passed therethrough at a desired speed during which the yarn is heated by the latent heat of vapor, thus the crimped state of the yarn is thoroughly heat set.

Therefore according to this device, it enables the entire length of a narrow channel 12 to be in uniform temperature. Hence the minor vessels 11 are communicated to one another with upper tubes 13 and lower tubes 14, all of the minor vessels are kept in uniform temperature when heated by hot vapor, thus each of said channels can keep an equal temperature.

Further, whereas a plurality of minor vessels 11 constitutes an assembled vessel 15, the number of such minor vessels may be varied according to number of yarn delivered from the crimping device.

I claim:

1. Apparatus for heat treatment of synthetic fiber yarn, comprising:

(A) a completely closed vessel;

(B) a liquid heat transfer medium partially filling the vessel;

(C) a heating element immersed in said liquid and adapted to convert part thereof to a vapor which fills the remainder of the vessel and cooperates with the liquid medium to maintain the vessel at a uniform temperature;

(D) and means carried by and heated from the vessel providing narrow channels through which yarn to be heated can be passed for heat processing at substantially uniform temperature all along the length of the channels.

2. The apparatus of claim 1, wherein the vessel is comprised of a row of upper minor vessels, said minor vessels being directly connected together at their upper and lower portions by substantially short tubes which open directly into the vessels.

References Cited by the Examiner UNITED STATES PATENTS Lewis I 2862 X Benn 2862 Kinney.

Carter et a1. 2862 X a 4 3,077,313 2/ 1963 Seney 2862 X 3,101,990 8/1963- Heighten 2862 X 3,177,931 4/ 1965 Carruthers.

FOREIGN PATENTS 862,002 3/ 1961 Great Britain.

MARVIN STEIN, Primary Examiner.

DONALD W. PARKER, Examiner.

Gilchrist et a1. 2862 10 H. S. JAUDON, Assistant Examiner. 

1. APPARATUS FOR HEAT TREATMENT OF SYNTHETIC FIBER YARN, COMPRISING: (A) A COMPLETELY CLOSED VESSEL; (B) A LIQUID HEAT TRANSFER MEDIUM PARTIALLY FILING THE VESSEL; (C) A HEATING ELEMENT IMMERSED IN SAID LIQUID AND ADAPTED TO CONVERT PART THEREOF TO A VAPOR WHICH FILLS THE REMAINDER OF THE VESSEL AND COOPERATIES WITH THE LIQUID MEDIUM TO MAINTAIN THE VESSEL AT A UNIFROM TEMPERATURE; (D) AND MEANS CARRIED BY AND HEATED FROM THE VESSEL PROVIDING NARROW CHANNELS THROUGH WHICH YARN TO BE HEATED CAN BE PASSED FOR HEAT PROCESSING AT SUBSTANTIALLY UNIFORM TEMPERATURE ALL ALONG THE LENGTH OF THE CHANNELS. 